System and Method for Uplink Timing Synchronization in Conjunction with Discontinuous Reception

1. A method in a network access equipment, comprising: transmitting a timing alignment update command for adjusting an uplink timing alignment of a user device; resetting a timing alignment timer in response to transmitting the timing alignment update command; configuring a discontinuous reception (DRX) mode for the user device; configuring at least one of a first sounding reference signal (SRS) mode and a second SRS mode for the user device; receiving an SRS during a DRX active time when the first SRS mode is used; receiving an SRS irrespective of the DRX active time when the second SRS mode is used; releasing a resource configuration for the user device to transmit the SRS upon expiration of the time alignment timer; and maintaining the resource configuration for the user device to transmit the SRS when not in the DRX active time.

2. The method of claim 1 , further comprising sending an instruction to the user device to activate the second SRS mode.

3. The method of claim 1 , wherein the DRX cycle is determined based on a level of communication activity of the user device.

4. The method of claim 1 , further comprising determining a SRS repetition period for the user device to transmit the SRS.

5. The method of claim 1 , further comprising transmitting a SRS configuration element to the user device, the SRS configuration element including the resource configuration for the user device to transmit the SRS.

6. The method of claim 1 , further comprising releasing a resource configuration for the user device to transmit channel quality indictor (CQI) upon expiration of the time alignment timer.

7. The method of claim 1 , further comprising determining a DRX cycle for the user device.

8. A network access equipment for a wireless telecommunications system, comprising: a transmitter configured to transmit a timing alignment update command for adjusting an uplink timing alignment of a user device; a receiver; and a processor, the processor configured to perform operations comprising: resetting a timing alignment timer in response to transmitting the timing alignment update command; configuring a discontinuous reception (DRX) mode for the user device; configuring at least one of a first sounding reference signal (SRS) mode and a second SRS mode for the user device; controlling the receiver to receive an SRS during a DRX active time when the first SRS mode is used; controlling the receiver to receive an SRS irrespective of the DRX active time when the second SRS mode is used; releasing a resource configuration for the user device to transmit the SRS upon expiration of the time alignment timer; and maintaining the resource configuration for the user device to transmit the SRS when not in the DRX active time.

9. The network access equipment of claim 8 , wherein the processor is further configured to control a transmitter to send an instruction to the user device to activate the second SRS mode.

10. The network access equipment of claim 8 , wherein the DRX cycle is determined based on a level of communication activity of the user device.

11. The network access equipment of claim 8 , wherein the processor is further configured to determine a SRS repetition period for the user device to transmit the SRS.

12. The network access equipment of claim 8 , wherein the processor is further configured to controlling a transmitter to transmit a SRS configuration element to the user device, the SRS configuration element including the resource configuration for the user device to transmit the SRS.

13. The network access equipment of claim 8 , wherein the processor is further configured to release a resource configuration for the user device to transmit channel quality indictor (CQI) upon expiration of the time alignment timer.

14. The network access equipment of claim 8 , wherein the processor is further configured to determine a DRX cycle for the user device.